JP2017114187A - Tire structure body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tire structure body capable of easily following various ups and downs of an off-road when a vehicle is travelling, with no puncture.SOLUTION: A tire structure body includes a tire body 1 equipped with a ring part 5 in which a sidewall part 4 is formed on one side while the other side being an open end 3, and a frame 11 equipped with a leaf spring part 13 which is arranged on an inner peripheral surface side of the tire body 1 and contacts to the inner peripheral surface of the tire body 1 to buffer a force that is received from the outside of the ring part 5. Thus, the ring part 5 of the tire body 1 that receives impact from a rough of the ups and downs deforms together with the leaf spring part 13, buffering the impact. Thus, a vehicle equipped with such a tire structure body can follow ups and downs in various sizes during travel, causing no puncture during travel.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a tire structure for a vehicle.

There are vehicles whose main purpose is to travel on so-called rough terrain, which is not a road that is easy to travel, such as leveled or paved. Such vehicles include, for example, vehicles such as tractors used in agricultural lands, four-wheel drive vehicles for disaster rescue that perform rescue activities in disaster areas and wasteland, four-wheel drive vehicles for off-road races that are performed on dirt courses, etc. It is done.
In such vehicles, it is common to use tires that are different from ordinary automobiles. For example, in a tractor, it is wider than a regular passenger car tire so that it does not slip on soft farmland with large undulated plowing (it is also sticky in rainy weather) and does not sink and the tire grips firmly on the soil. A large convex pattern of anti-slip is formed. Patent documents 1 and 2 are mentioned as an example of such a tractor tire.

Japanese Utility Model Publication No. 1-122306 No. 2-11203

However, changing the convex pattern of the tire or changing the width of the tire has a limit in adapting to farmland under various different conditions. The same applies to all rough terrain other than farmland, such as disaster and wasteland. Especially in disaster areas, you may be required to drive on landslides that have collapsed due to landslides, or to drive without puncture on the way of various river spills and other spills. For this reason, there has been a demand for a tire structure that has high followability with respect to the undulations of rough terrain traveling and does not puncture.
The present invention has been made paying attention to such problems of the prior art. An object of the present invention is to provide a tire structure that can easily follow various undulations on rough terrain and does not puncture when the vehicle is running.

In order to solve the above-described problem, in the first means, a tire body having a ring portion having a sidewall portion formed on one side and an open end on the other side, and disposed on the inner peripheral surface side of the tire body And a frame provided with a spring portion that contacts at least the inner peripheral surface of the ring portion and cushions the force received from the outside of the ring portion.
By using a tire with a tire structure configured in this way for a vehicle, there is a large unevenness on the terrain where the ring part of the tire body contacts the ground, and the load applied to the ring part (impact pressure from the outside) When this occurs, the spring portion together with the ring portion is appropriately bent or compressed through the ring portion and deformed. The tire as a whole is deformed according to the unevenness, so that the shock is buffered and the posture of the vehicle itself is maintained. Once the spring portion is deformed, elastic energy is accumulated by being biased. After deformation, the energy is returned to the original shape by using this energy as a reaction force, so that the shape of the tire structure is maintained in a fixed shape.
With such a configuration, the ring part of the tire body that has received an impact from the unevenness of the undulation is deformed together with the spring part to buffer (absorb) the impact, so that the vehicle can follow various undulations on uneven terrain. It can travel stably. In addition, since the vehicle is not punctured, it is possible to provide a tire structure suitable for wide use in vehicles used on rough terrain.

Here, the frame having the “spring portion” has a function different from that of a tire frame used for a tire having a normal structure including a rubber tube having sidewalls on both sides and filled with air. Even if the tire frame is precisely measured, it is physically deformed by receiving pressure, but the tire frame is rather a skeletal member that supports the tire so that it does not easily deform according to irregularities. So do not expect spring force.
The “spring part” is a member that generates an urging force by expanding and contracting or bending when receiving an impact pressure on the ring part, and a specific configuration thereof includes, for example, a leaf spring. As described below, the leaf spring may have a configuration in which a plurality of spring plate pieces extend radially, for example, or may not have a plurality of spring plate pieces. In the case of using a leaf spring, it may be arranged so that the surface direction faces the inner peripheral surface direction of the tire main body because it can contact the tire main body and receive impact pressure on as many surfaces as possible. However, you may make it contact | connect only the inner peripheral surface of a ring part. Further, for example, a coil spring may be used instead of the leaf spring. In that case, it is preferable to arrange the plurality of coil springs radially so that the axis of the spring is arranged from the center side of the tire body toward the inner peripheral surface of the ring portion.
The “spring portion” may be formed integrally with the frame, or may be made of a material different from that of the frame. Since a joint part is not formed when integrally molded, there is no deterioration in strength due to member contact on the joint surface, and the same material as the frame can be used. As a material of the frame, for example, a plastic material, for example, a high-strength engineering plastic such as ABS resin, nylon resin, or polycarbonate is preferably used. An alloy is preferably used. As the alloy, for example, a stainless alloy, a high-strength aluminum alloy, a magnesium alloy, a titanium alloy or the like is preferable. Carbon materials may also be used.
As the “tire body”, for example, the same rubber material as that of a normal tire is preferably used. The tire body is preferably made of a single material without inserting other materials because of the holding by the frame and the followability of the movement of the spring plate. If there is no problem with the followability of the movement of the spring plate part, like a normal tire, for example, a reinforcing layer such as a fiber belt or a steel belt, or an element such as a radial carcass is inserted alone or in multiple layers It is good also as a tire main part.
In addition, the tire body has a structure in which “a sidewall portion is formed on one side and a ring portion on the other side is an open end” is formed, and sidewall portions are formed on both sides like a normal tire body. The ring part is supported from both sides by the sidewall part, and the followability of the ring part to the terrain may not be changed, and it is difficult to attach the frame including the ring part to the inner peripheral surface of the tire body. Based on that.

As a second means, the sidewall portion is formed with a cylindrical portion protruding in the open end direction at a position concentric with the center of the ring portion.
By setting it as such a structure, the intensity | strength of a side wall part improves and the intensity | strength of a tire book cheer increases as a result. In addition, since the frame can be mounted using the cylindrical portion as a base, positioning of the frame can be easily performed.
Here, the “cylindrical portion” widely refers to one that is elongated and is hollowed out. It does not necessarily mean only a cylinder. Further, one of the openings may be bottomed or may be bottomless in communication with the front and back, or may have a flange-like protrusion in part.
Further, as a third means, the inner peripheral surface of the cylindrical portion is formed so as to be evenly spaced in the axial direction.
With this configuration, the inner circumferential surface of the cylindrical portion has the same inner width (in the case of a cylinder, the inner diameter) in the length direction, and therefore a member having the same width as the inner circumferential surface of the cylindrical portion is inserted. be able to. And it becomes easy to fix a flame | frame with a cylindrical part as a base by connecting the member and a flame | frame.
As a fourth means, a cap portion is formed at the center of the frame, and the cap portion is fitted to the cylindrical portion.
If comprised in this way, it becomes possible to attach a flame | frame to a cylindrical part via a cap part, and positioning of a flame | frame becomes easy. Further, since the vicinity of the center of the tire body is surrounded, the vicinity of the center of the tire structure is firmly held, and deformation near the center due to rotation is prevented.

As a fifth means, a hub member that passively drives the rotational force of the driving source is fixed to the inner peripheral side of the cylindrical portion.
As a result, the rotational force of the drive source is transmitted to the tire structure by the hub member. That is, since the drive transmission of the rotational force of the drive source does not directly form the tire structure, it is not necessary to adopt a connection structure with a drive transmission mechanism that is structurally impossible for the frame. Examples of the driving source include an engine using a normal oil / natural gas fuel and an electric motor device. Any of these may be used as a drive source.
As a sixth means, the hub member and the cap portion are connected and fixed through an opening formed in the cylindrical portion.
As a result, the frame can be firmly fixed to the hub member in the vicinity of the center, and the rotational force of the drive source can be transmitted to the tire body.
As a seventh means, the hub member and the cap portion are connected and fixed in a state where a part or all of the cylindrical portion is sandwiched.
Accordingly, since the tire body is sandwiched between the hub member and the frame while the frame is connected to the hub member, the rotational force of the drive source can be reliably transmitted to the entire tire body.
As an eighth means, the hub member is a bottomed cylindrical body, and the bottom portion is arranged to face the tip position of the cylindrical portion.
As a result, a member related to the drive source, such as a drive transmission mechanism, can be advanced to the inner peripheral side of the hub member, and further, by connecting the bottom of the hub member and the frame, the rotational force of the drive source is applied to the hub member more to the tire. It can be transmitted at a close position.
As a ninth means, the drive shaft for transmitting the rotational force of the drive source is directly or indirectly connected to the bottom of the hub member.
Thus, the rotational force of the drive source is transmitted by connecting the bottom portion of the hub member and the frame, and connecting the drive source and the bottom of the hub member. Here, “the drive shaft is directly or indirectly connected to the bottom of the hub member” means that the drive shaft of the drive source is directly connected to the bottom of the hub member and an intermediate part such as a drive transmission mechanism in the middle. It indicates that there are both cases where a member is interposed. For example, when the rotational speed or torque is changed, it is preferable to connect indirectly. In this case, the drive transmission mechanism can be arranged inside the hub member, and the structure is made compact.

As a tenth means, the frame and the hub member are fixed by fixing means from the frame side.
As a result, the hub member can be attached to the drive source side first, the frame can be fixed to the hub member together with the tire body from the tire body side, and only the tire body and the frame can be easily removed from the vehicle.
Here, the “fixing means” is, for example, a screw and a screw hole. With the through hole formed in the frame matched to the screw hole formed on the hub member side, the screw is screwed from the frame side to the hub. Secure to the member. Alternatively, for example, a hub cap may be used. In this case, hold the frame with the hub cap from the outside of the frame, and fix the frame to the hub member by screwing the screw in the state where the through hole of the hub cap and the screw hole formed on the hub member side are collated. To.
As an eleventh means, the housing on the drive source side is advanced into the hub member, and the hub member is held by a bearing member with respect to the outer periphery of the housing.
As a result, the tire body and the frame are rotated together with the hub member by the rotational force from the driving source, and at the same time, the hub member rotates while being supported on the outer periphery of the housing, so that it is held in a cantilever shape. The tire body and the frame can be firmly supported by the hub member.

As a twelfth means, the spring portion is constituted by a plurality of spring plate pieces extending radially from the center.
If the spring portion is a spring plate piece in this way, the spring portion can be formed integrally with the frame, and an urging force (spring force) is generated by bending as a plate spring. It is possible to easily adjust the spring force by adjusting the width, number, thickness, or changing the material. Moreover, since it is a leaf | plate spring shape, it can be along the inner periphery of a tire main body, and it can reduce weight without being bulky. The spring plate piece may or may not be arranged so that the surface side always faces the sidewall portion of the tire body and the inner peripheral surface of the ring portion.
A plurality of spring plate pieces having the same shape may generate a balanced urging force over the entire circumference of the ring portion. When the interval between adjacent spring plate pieces is small and the number of spring plate pieces is small, the shape is a shape in which a slit is provided in the bulged portion that bulges into a bowl shape, but that case can also be interpreted as a spring plate piece. is there.
Further, as a thirteenth means, the spring portion is configured to have a portion that is in close contact with the inner peripheral surface of at least one of the ring portion and the sidewall portion.
If comprised in this way, the responsiveness of a spring part will improve with respect to the impact pressure from the outside to a ring part and the said sidewall part, and the followability with respect to an unevenness | corrugation will improve.
In the case of close contact, it is good for all to be in close contact in order to maintain and maintain the regularity of the tire body. You may comprise as follows.
Further, as a fourteenth means, it is configured so as to be rotationally symmetric with respect to the center of the ring part or to be symmetric with respect to an axis of symmetry passing through the center of the ring part.
With such a configuration, the spring portion can be uniformly deformed against the impact pressure from the outside over the entire circumference of the tire structure, and the stability of the vehicle wheel when rotating is improved.

As a fifteenth means, the inner peripheral surface of the ring portion and the sidewall portion is continuously connected by a curved surface.
Further, as a sixteenth means, the outer peripheral surface of the ring portion and the sidewall portion is continuously connected by a curved surface.
If the ring or sidewall is a discontinuous surface, it will be affected by the discontinuous part when it is deformed by impact pressure. It may not be possible. Such a configuration eliminates such a fear.
As a seventeenth means, an anti-slip pattern is formed at least on the outer periphery of the ring portion.
This increases the gripping force of the tire body when the vehicle is traveling, which is advantageous for traveling in a slippery place.

  In the tire structure of the present invention, the ring portion of the tire body that has received an impact from the unevenness of the undulation can be deformed together with the spring portion to buffer the impact. It can follow ups and downs of large and small, and the tire does not puncture during running.

BRIEF DESCRIPTION OF THE DRAWINGS (a) of the tire main body which makes a part of tire structure of embodiment is a front view, (b) is a rear view. BRIEF DESCRIPTION OF THE DRAWINGS (a) of the tire frame which makes a part of tire structure of embodiment is a side view, (b) is a front view. The partially broken side view of the tire hub which makes a part of tire structure of embodiment. The disassembled perspective view explaining the tire structure of embodiment and the drive transmission system connected to it. The disassembled perspective view explaining the back side of the exploded perspective view of FIG. FIG. 6 is a side sectional view for explaining a state where the tire structure and the drive transmission system of FIGS. 4 and 5 are assembled. The perspective view of the tire frame of other embodiments.

Hereinafter, specific embodiments of the present invention will be described with reference to the drawings.
As shown in FIGS. 1, 4 and 6, a tire body 1 which forms a part of a tire structure according to an embodiment of the present invention has a communication hole 2 having a circular cross section which communicates with the front and back at the center. It is an integral molded product made of synthetic rubber with a bowl-shaped outer shape. More precisely, it has a three-dimensional shape in which a tire that is a generally donut-shaped generally torus (torus) is equally divided into two in the direction perpendicular to the axial direction of the central communication hole. One side surface of the tire body 1 (that is, the edge side of the bowl shape) is an open end 3, and the shape of the open end 3 is a perfect circle and exists on the same plane.
As shown in FIG. 1 (a), the inner peripheral surface 1a of the annular body portion of the tire body 1 is exposed to the open end 3 side. The annular body portion of the tire body 1 includes a ring-shaped belt portion 4 serving as a tire ground contact portion adjacent to the open end portion 3, a circumferential direction that is surrounded by the belt portion 4 and extends to the position of the outer opening 2 a of the communication hole 2. The sidewall portion 5 is curved so as to protrude outward in the radial direction. The belt part 4 and the side wall part 5 are configured smoothly and continuously, and the boundary surface between them is unclear. The belt part 4 and the side wall part 5 near the belt part 4 are configured to have the same thickness, and the base part of the side wall part 5 is configured to gradually increase in thickness.
The tire body 1 has a plurality of outer peripheral surfaces 1b (that is, outer peripheral surfaces of the belt portion 4 and the sidewall portion 5) extending from the position of the outer opening 2a of the communication hole 2 to the open end portion 3 (in this embodiment, twelve). Lugs 6 are formed as anti-slip patterns. The lugs 6 are radially arranged at equal intervals from the position of the outer opening 2a of the communication hole 2 as a base point, and are configured in a trapezoidal shape in cross section. Further, the lug 6 is configured to gradually become wider and bulky from the outer opening 2 a of the communication hole 2 toward the open end 3.

A cylindrical portion 7 is formed at the position of the communication hole 2 of the tire body 1. The cylindrical portion 7 extends in the direction of the open end 3 with the outer opening 2a as a base. A flange 9 projecting inward is formed at the tip of the cylindrical portion 7. The inner peripheral edge of the flange 9 constitutes an inner opening 2b formed in a perfect circle shape. The inner peripheral surface 7 a of the cylindrical portion 7 becomes the communication hole 2. The outer peripheral surface 7b of the cylindrical portion 7 is smoothly and continuously connected to the inner peripheral surface of the sidewall portion 5 (that is, the inner peripheral surface 1a of the torus). The outer peripheral surface 7b of the cylindrical part 7 is comprised by the taper surface that an outer diameter becomes small as the front-end | tip. On the other hand, the diameter of the inner peripheral surface 7a of the cylindrical portion 7 is configured to be uniform in the axial direction. That is, the cylindrical portion 7 is configured such that the thickness becomes thinner toward the tip. The axial center of the communication hole 2 coincides with the center of the tire body 1. On the inner peripheral surface 7a side facing the outer opening 2a, a shelf portion 8 having a diameter wider than that of the inner peripheral surface 7a is formed over the entire periphery.
The tire body 1 has a rotationally symmetric shape at the center of the tire body 1 and a line-symmetric shape that passes through the center of the tire body 1 (that is, in the diameter direction).

Next, the tire frame 11 disposed on the inner peripheral surface 1a side of the tire body 1 that also forms part of the tire structure will be described.
As shown in FIGS. 2, 4, and 6, the tire frame 11 includes a cap portion 12 disposed in the center, and a plurality of (six in this embodiment) leaf springs formed around the cap portion 12. This is an integrally molded product made of ABS resin composed of the portion 13. The cap portion 12 is a tapered cylindrical body configured with a uniform wall portion having a small thickness with a smaller diameter at the tip. A flange 14 projecting inward is formed at the tip of the cap portion 12. The inner peripheral edge of the flange 14 constitutes an opening 14 a having the same diameter as the inner opening 2 b of the tubular portion 7 of the tire body 1. The shape of the inner peripheral surface 12 a of the cap portion 12 is a shape that is fitted in a relationship between the outer peripheral surface 7 b shape of the tubular portion 7 of the tire body 1 and the male female.
Each leaf spring portion 13 is an elastic member extending in a cantilever shape having the same shape and adjacent to each other arranged at equal intervals. Each leaf spring portion 13 is configured as a continuous surface along the surface of the cap portion 12. Each leaf spring portion 13 is extended from the base to the rear of the cap portion 12 with reference to the base position B of the cap portion 12 in FIG. 2A, and is curved while being outwardly expanded to change its direction. It extends in the tip direction.
The front end of each leaf spring portion 13 is advanced slightly forward from the front surface of the cap portion 12. Each leaf spring portion 13 extends from the base position B of the cap portion 12 with an equal width, and is in close contact with the sidewall portion 5 and the belt portion 4 when the tire frame 11 is disposed on the tire body 1. The tire frame 11 is a straight line that is rotationally symmetric at the center of the tire frame 11 (center of the opening 14a), passes through the center of the tire frame 11, and passes through the center of the leaf spring portion 13 or the center between adjacent leaf spring portions 13. It has a line-symmetric shape.
When a load is applied to the leaf spring portion 13, the tire frame 11 having such a configuration is converted into elastic energy by bending and deforming the load, and after the deformation, the elastic energy is converted into a reaction force (biasing force). ) To return to the original shape.

Next, the tire hub 15 disposed in the cylindrical portion 7 of the tire body 1 that also forms part of the tire structure will be described.
As shown in FIGS. 3, 4, and 6, the tire hub 15 is a cylindrical body made of an alloy, a ceiling portion 16 is formed on the front end side, and a flange 17 is formed on the entire circumference of the base end side. . The diameter of the inner peripheral surface 15a of the tire hub 15 is configured to be uniform in the axial direction. The diameter of the outer peripheral surface 15b of the tire hub 15 is the same size as the diameter of the inner peripheral surface 7a of the cylindrical portion 7 (the diameter of the outer peripheral surface 15b of the tire hub 15 is slightly smaller in order to avoid interference). A ring portion 18 projecting forward is formed around the ceiling portion 16. A plurality of through holes 19 for screws are formed in the ceiling portion 16, and a plurality of screw holes 20 for screws are formed in the ring portion 18.
An expansion portion 15c having a slightly larger diameter than the inner peripheral surface 15a is formed on the inner peripheral surface 15a side of the tire hub 15 and on the proximal end side.

Next, an example of an assembly configuration when the tire structure having such a configuration is assembled to a vehicle will be described. In this embodiment, the vehicle uses a brushless motor 21 as a drive source. Below, let the inner peripheral surface 1a side of the tire main body 1 be the front.
As shown in FIGS. 4 to 6, on the tire structure side, a tire frame 11 is disposed on the front side with respect to the tire body 1, and a tire hub 15 is disposed on the rear side. On the other hand, the brushless motor 21 is accommodated in a first housing 22 at the tip of a linear actuator (not shown) extending from the vehicle, and the rear side is fixed in the first housing 22 by a screw 23. A heat sink 25 for cooling the brushless motor 21 is fixed to the rear of the first housing 22 with screws 26 via an O-ring 24.
A second housing 27 is connected and fixed to the front of the first housing 22 by an screw 29 via an O-ring 28. As shown in FIG. 6, the rear side of the brushless motor 21 is accommodated on the first housing 22 side, and the front side is accommodated on the second housing 27 side. The second housing 27 includes a cylindrical main body 27A and a flange 27B formed on the rear base side. The outer diameter of the main body 27 </ b> A is configured to be slightly smaller than the diameter of the inner peripheral surface 15 a of the tire hub 15. An opening 27a is formed at the front end of the main body 27A of the second housing 27, and a gear box case 31 is fitted into the opening 27a (that is, the inner peripheral surface of the main body 27A) via an O-ring 32. . The drive shaft 21 a of the brushless motor 21 is projected forward from the through hole 31 a on the bottom surface of the gear box case 31.
A gear box 33 is disposed in the gear box case 31. The gear box 33 includes a base 33A and a rotating part 33B. The base 33 </ b> A of the gear box 33 is fixed to the front surface of the second housing 27 with screws 34. A wave generator (planetary gear device) 35 is disposed in the base 33A. The front end of the drive shaft 21a is connected to the wave generator 35, and the rotation of the drive shaft 21a is decelerated and the torque is increased. The rotating unit 33B rotates at the number of rotations decelerated by the wave generator 35 and transmits the rotation. The front surface of the rotating portion 33 </ b> B is fixed by screws 42 from the front side of the tire hub 15 with the screw holes 36 collated with the through holes 19 of the ceiling portion 16 of the tire hub 15.

On the other hand, an oil seal 37, a spacer 38, and a bearing 39 as a bearing member are disposed in order from the rear on the outer periphery of the main body 27A of the second housing 27. As shown in FIG. 6, in the assembled state, the main body 27A of the second housing 27 is disposed to face the expansion portion 15c of the tire hub 15, and an oil seal 37 and a spacer 38 are provided in the gap between the expansion portion 15c and the outer periphery of the main body 27A. The bearing 39 is buried. The tire hub 15 is held at the outer peripheral position of the second housing 27 by the bearing 39. In this way, a drive transmission system is constructed in which the first housing 22 is used as a base point and the tire hub 15 is assembled. The driving force (rotational force) from the brushless motor 21 is transmitted to the tire hub 15, and the tire hub 15 rotates around the second housing 27.
The cylindrical portion 7 of the tire body 1 is fitted to the tire hub 15 of such a drive transmission system. And the tire frame 11 is arrange | positioned so that the cap part 12 may be fitted by the cylindrical part 7 from the front surface of the tire main body 1. FIG. At this time, the flange 17 of the tire hub 15 fits on the shelf portion 8 of the tubular portion 7, and the front surface of the ring portion 18 of the tire hub 15 contacts the back surface of the flange 9 of the tubular portion 7. The outer peripheral surface 15b of the tire hub 15 and the inner peripheral surface 7a of the cylindrical portion 7 are in close contact with each other.
At this time, as shown in FIG. 6, the flange 9 of the tubular portion 7 is sandwiched between the tire hub 15 and the tire frame 11 from the front and rear. The leaf spring portion 13 of the tire frame 11 is in close contact with the inner peripheral surface 1a (with the sidewall portion 5 and the belt portion 4) of the tire body 1. The tip of the leaf spring portion 13 is flush with the open end 3 of the tire frame 11 and does not protrude outward from the open end 3. Finally, the wheel cap 41 is fitted into the space surrounded by the flange 9 of the tubular portion 7 and the flange 14 of the cap portion 12 on the front surface of the tire hub 15 via the O-ring 40. With the wheel cap 41 attached, the wheel cap 41 is flush with the open end 3 of the tire frame 11 and does not protrude outward from the open end 3. Assembling is completed by screwing the screw 43 into the screw hole 20 of the ring portion 18 of the tire hub 15 via the wheel cap 41.

By configuring as described above, the following effects are achieved in the above embodiment.
(1) In the vehicle using the tire structure as described above, when the tire main body 1 collides with the undulating unevenness in use on rough terrain, the leaf spring portion 13 of the tire frame 11 together with the tire main body 1 is provided. Since the impact is buffered by bending, the stability of the vehicle itself is ensured. If the undulation is removed, the tire frame 11 is restored to its original shape by the elastic energy that is deflected, which is particularly advantageous in terrain with a large undulation. Further, since the tire body 1 does not have a tire tube, the tire does not puncture during traveling.
(2) Since the tire main body 1 has a shape in which the inner peripheral surface 1a is greatly exposed just by having the sidewall portion 5 on only one side unlike a normal toric tire, the tire frame 11 can be easily mounted. . Further, when the side wall portion 5 is provided only on one side and the other side is the open end portion 3, the belt portion 4 which is the most in contact with the terrain is easily bent when subjected to the impact pressure of the undulation. Furthermore, since the cylindrical portion 7 is provided at the center position even when the sidewall portion 5 is on only one side, the regularity of the tire body 1 is maintained. Further, although the tire body 1 alone can maintain its regularity, the tire frame 11 is not deformed even if it receives some external force by mounting the tire frame 11.
(3) The tire structure needs to bend the leaf spring portion 13 of the tire frame 11 together with the tire body 1 against the undulation, but it is desirable to maintain the original shape except for the portion that receives the impact pressure of the undulation. In the present embodiment, the cylindrical portion 7 is provided at the center position, and the cylindrical portion 7 and the sidewall portion 5 are particularly configured to be thicker near the base portion, and a tire hub 15 is provided inside the cylindrical portion 7 inside the cylindrical portion 7. It is in close contact with the peripheral surface 7a. Further, the flange 9 of the tubular portion 7 is sandwiched between the tire hub 15 and the tire frame 11 from the front and rear (the distal end of the tubular portion 7 is regulated). For this reason, the regularity of the tire structure as a whole other than the portion that bends with respect to the undulations is sufficiently maintained. Further, since the tire frame 11 is structured to be connected to the tire hub 15, the tire frame 11 is advanced into the cylindrical portion 7 of the tire body 1 in order to connect the drive transmission system and the tire frame 11. There is no need to do.
(4) Since the leaf spring portion 13 of the tire frame 11 is in close contact with all the radial directions of the sidewall portion 5 to the belt portion 4 of the tire body 1 and supports the external force applied to the tire body 1 over the entire circumference, When the vehicle is not subjected to the partial pressure of the vehicle, for example, when traveling on a flat road, the running does not become uneven.
(5) The leaf spring portion 13 is extended in a cantilever shape, and the belt portion 4 side that is easily subjected to the undulating impact pressure is located farthest from the cap portion 12 so that it is easily bent. On the other hand, the central portion of the leaf spring portion 13 is relatively difficult to bend, so that stable rotation is maintained.
(6) The tire hub 15 is held and rotated at two positions apart from the rotating portion 33B of the wave generator 35 and the bearing 39, and in particular, the second housing 27 via the bearing 39 at the rear position on the inner periphery of the tire hub 15. Rotation stability is good because it is held around
(7) The rotating portion 33B is connected at a position very close to the tire structure, ie, the center position in the front-rear direction of the tire frame 11 at the innermost end of the tire hub 15, and transmits the rotational force to the tire hub 15. Can be brought closer to the tire structure, and uneven rotation is less likely to occur.
(8) Since the tire body 1 is smoothly and continuously configured with the same thickness from the sidewall portion 5 to the belt portion 4, the tire body 1 bends in a discontinuous and strange direction when deformed by impact pressure. There is no such thing, and it will be deformed appropriately according to the undulations.
(9) Since the tire structure includes the tire frame 11 and the leaf spring portion 13 serves as a cushion, the tire structure can be used as a vehicle even if a cushion member such as a suspension is not provided between the tire structure and the vehicle. It becomes.

The above embodiments are merely described as specific embodiments for illustrating the principle of the present invention and the concept thereof. That is, the present invention is not limited to the above embodiment. The present invention can also be embodied in the following modified form, for example.
The shape of the tire main body 1 described above is an example, and implementation in other forms is also possible as with a normal tire. For example, the front-rear width with respect to the length in the radial direction can be appropriately changed. Moreover, the presence or absence of the lugs 6 and the shape and number of the lugs 6 can be changed as appropriate. It is also possible to configure so that the cylindrical part 7 is not provided.
-The shape of the tire frame 11 described above is an example, and other embodiments can be freely implemented. For example, in the above description, the leaf spring portion 13 of the tire frame 11 is extended along the inner peripheral surface 1a of the tire body 1, but the tire frame 45 may be configured as shown in FIG. The tire frame 45 includes a cap portion 46 fitted to the cylindrical portion 7 of the tire body 1 and a leaf spring portion 47 integrally formed with the cap portion 46 at positions shifted by 90 degrees on the outer periphery of the cap portion 12. Has been. The leaf spring portion 46 is an elastic member configured to have a frame shape in which the end surface shape is a fan shape. The leaf spring portion 46 includes left and right legs 46A and a contact plate 46B supported by the legs 46A. Unlike the leaf spring portion 13 of the above embodiment, the leaf spring portion 46 does not extend along the inner peripheral surface 1a of the tire body 1. The outer surface of the contact plate 46B is configured to contact the inner peripheral surface of the belt portion 4.
A coil spring may be used instead of the leaf spring portion 13 of the tire frame 11 (or the leaf spring portion 47 of the tire frame 45). In that case, it is preferable that the compression direction (axial direction) of the coil spring is in contact with the inner peripheral surface of the belt portion 4.
In the above embodiment, the outer shape of the tire hub 15 is configured in a cylindrical shape, but may be a cylindrical shape having an outer diameter such as a regular hexagon or a regular octagon other than the cylindrical shape. In that case, the inner peripheral surface 7a of the tubular portion 7 to be fitted is also configured in a corresponding polygonal shape.
In the above description, the brushless motor 21 is given as an example of the drive source. However, the drive source may be used as a wheel for a vehicle that uses an engine that uses ordinary fuel as a drive source.
Good.
In the above embodiment, the leaf spring portion 13 of the tire frame 11 is configured to be in close contact with all the radial directions of the sidewall portion 5 to the belt portion 4 of the tire body 1, but all of the radial directions are always in close contact with each other. It doesn't have to be. For example, the tire body 1 may be deformed to be in close contact with the leaf spring portion 13 when an external force is applied instead of being partly in close contact.
-It is free to change the material of the tire body 1 and the tire frame 11 as appropriate.
In addition, it is free to implement in a mode that does not depart from the spirit of the present invention.

  DESCRIPTION OF SYMBOLS 1 ... Tire main body, 4 ... Ring part, 5 ... Side wall part, 11 ... Frame, 13 ... Leaf spring part as a spring part.

Claims (17)

A tire body having a ring portion with a sidewall portion formed on one side and an open end on the other side;
And a frame provided with a spring portion disposed on the inner peripheral surface side of the tire body and buffering a force received from the outside of the ring portion in contact with at least the inner peripheral surface of the ring portion. Structure.   2. The tire structure according to claim 1, wherein a cylindrical portion that protrudes toward the open end is formed at a position that is concentric with the center of the ring portion.   The tire structure according to claim 2, wherein the inner peripheral surface of the cylindrical portion is formed so as to be evenly spaced in the axial direction.   The tire structure according to claim 2 or 3, wherein a cap portion is formed at a center of the frame, and the cap portion is fitted into the cylindrical portion.   The tire structure according to claim 4, wherein a hub member that passively drives a rotational force of a drive source is fixed to an inner peripheral side of the cylindrical portion.   The tire structure according to claim 5, wherein the hub member and the cap portion are connected and fixed through an opening formed in the cylindrical portion.   The tire structure according to claim 6, wherein the hub member and the cap portion are connected and fixed in a state where a part or all of the cylindrical portion is sandwiched.   The tire structure according to any one of claims 5 to 7, wherein the hub member is a cylindrical body with a bottom, and the bottom portion is disposed so as to face a tip position of the cylindrical portion.   The tire structure according to claim 8, wherein a drive shaft that transmits the rotational force of the drive source is directly or indirectly connected to the bottom of the hub member.   The tire structure according to any one of claims 5 to 9, wherein the frame and the hub member are fixed by fixing means from the frame side.   The tire structure according to any one of claims 5 to 10, wherein a housing on a drive source side is advanced into the hub member, and the hub member is held by a bearing member with respect to an outer periphery of the housing. body.   The tire structure according to any one of claims 1 to 11, wherein the spring portion is composed of a plurality of spring plate pieces extending radially from the center.   The tire according to any one of claims 1 to 12, wherein the spring portion is configured to have a portion that is in close contact with an inner peripheral surface of at least one of the ring portion and the sidewall portion. Structure.   It is comprised so that it may become rotationally symmetric with the said ring part center as a rotation center, or it may become line symmetrical with the symmetry axis which passes along the said ring part center. Tire structure.   The tire structure according to any one of claims 1 to 14, wherein an inner peripheral surface of the ring portion and the sidewall portion is continuously connected by a curved surface.   The tire structure according to any one of claims 1 to 15, wherein an outer peripheral surface of the ring portion and the sidewall portion is continuously connected by a curved surface.   The tire structure according to any one of claims 1 to 16, wherein an anti-slip pattern is formed at least on an outer periphery of the ring portion.

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